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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I had a weird problem with batches of TAD EL84s.
They worked fine but when brand new would produce a low level "crackly/burbly" noise. Low level, never notice it on a stage but definitely in a quiet workshop. The noise subsided over period of a few hours soak testing, especially if blasted into a load box.
Not all samples crackled but those that didn't could often be induced to do so if given a flick from finger and thumb. This led me to suspect the cause was a microscopic piece of debris in the valve that eventually got "gettered"?
I suspect Paul you had a TAD with a rather larger than microscopic piece of ***t!
The issue seemed resolve itself after a couple of months.
Dave.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
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